002——keil-Error: L6915E: Library reports error: __use_no_semihosting was requested解决

..\OBJ\KEY.axf: Error: L6915E: Library reports error: __use_no_semihosting was requested, but _ttywrch was referenced

这个问题很好解决，是说一个库没有引用。

勾选上，再编译就OK了！